Super Mario Bros. 2 (NES)/RAM map

The following article is a RAM map for Super Mario Bros. 2 (NES).

RAM

Counters

• $04ED - Current number of lives
• $05C5 - Current number of Continues
• $062A - Current number of cherries
• $062B - Current number of coins pulled in Subspace (Slot machine currency)
• $062C - Current number of BIG vegetables pulled for stop watch

Sprite Related

• $0014 - Page of main character's X position
• $001E - Page of main character's Y position

Position of sprites

X position on page

• $0028 - main character
• $0029 - enemy 5
• $002A - enemy 4
• $002B - enemy 3
• $002C - enemy 2
• $002D - enemy 1

Y position on page

• $0033 - enemy 5
• $0034 - enemy 4
• $0035 - enemy 3
• $0036 - enemy 2
• $0037 - enemy 1

Speed of sprites (left/right)

• $003C - Main character
• $003D - Enemy 5
• $003E - Enemy 4
• $003F - Enemy 3
• $0040 - Enemy 2
• $0041 - Enemy 1

Jumping Physics

• $0046 - main character
• $0047 - enemy 5
• $0048 - enemy 4
• $0049 - enemy 3
• $004A - Enemy 2
• $004B - Enemy 1

• $0050 - Is character on a vine?

00 - no
01 - yes

Misc. sprite addresses

• $0051 - Enemy 5
• $0052 - Enemy 4
• $0053 - Enemy 3
• $0054 - Enemy 2
• $0055 - Enemy 1

00 - Invisable
01 - Visable
02 - Dead

• $005A - Enemy 5's relation to main character/landscape
• $005B - Enemy 4's relation to main character/landscape
• $005C - Enemy 3's relation to main character/landscape
• $005D - Enemy 2's relation to main character/landscape
• $005E - Enemy 1's relation to main character/landscape

00 - not on the ground (could be jumping or being thrown)
04 - walking
05 - turn left because object blocks path
06 - turn right because object blocks path
20 - carrying main character when reaching an edge to turn around
24 - carrying main character with same speed as movement

Sprite's palette, mirroring, etc.

• $0065 - Enemy 5
• $0066 - Enemy 4
• $0067 - Enemy 3
• $0068 - Enemy 2
• $0069 - Enemy 1

Sprite IDs

• $008F - Character selected (appearance only, until defeated, then stats as well)

00 - Mario
01 - Princess
02 - Toad
03 - Luigi

• $0090 - Enemy 5
• $0091 - Enemy 4
• $0092 - Enemy 3
• $0093 - Enemy 2
• $0094 - Enemy 1

• $0096 - Item pulled up from ground

• $0099 - Graphics for when main character jumps
• $009A - Drop through
• $009B - Graphics for when main character walks

• $00C7 - Character's status

Sprite HP

• $0465 - Enemy 5
• $0466 - Enemy 4
• $0467 - Enemy 3
• $0468 - Enemy 2
• $0469 - Enemy 1

Main character

• $04C2 - Current life in the life meter

0F - One heart
1F - Two hearts
2F - Three hearts
3F - Four hearts

• $04C3 - Number of bars in the life meter (for visual purposes only)

FF - One bar (doesn't work very well)
00 - Two bars (default)
01 - Three bars
02 - Four bars

Timers

• $0085 - Amount of time left until main character becomes vulnerable
• $0086 - Amount of time left for unknown
• $0087 - Amount of time left before Bob Omb 5 explodes
• $0088 - Amount of time left before Bob Omb 4 explodes
• $0089 - Amount of time left before Bob Omb 3 explodes
• $008A - Amount of time left before Bob Omb 2 explodes
• $008B - Amount of time left before Bob Omb 1 explodes
• $008C - Amount of time left before Bomb 1 explodes
• $008D - Amount of time left before Bomb 2 explodes
• $008E - Amount of time left before Bomb 3 explodes
• $00B9 - Current time left to use Pidget's carpet
• $04B7 - Amount of time left in subspace
• $04E0 - Amount of time left as star Mario
• $04FF - Current amount of time left from the stop watch
• $14CA - Timer for crouch jump power (0 - 3C)

Item flags

• $009C - Holding an item?

00 = no
01 = yes

• $009D - Character's mirroring, etc. (not palette)
• $00A3 - Changes once for everytime Tweeter jumps

• $00AD - Is key held?

00 - no
01 - yes -  Key appears above head even if thrown, but then not chased.

• $00AE - Item in hand height (used for different character sizes?)

Misc.

• $00BA - Screen speed moving left and right

• $0100 - (screen hold?)

• $0415 - the rising of the heart
• $0416 - Height of whale's spout after peaking.

• $0456 - Current time left Hawkmouth (before Wart) is open

• $04EC - Level Transition.

00 - normal game play
01 - begin the same level and area again (like dying revive)
02 - game over
03 - end level, go to bonus game
04 - warp

• $06F6 - Character growing or shrinking

Button Related

• $00F5 - Button pressed (Controller 1)
• $00F6 - Button pressed (Controller 2)
• $00F7 - Button held (Controller 1)
• $00F8 - Button held (Controller 2)

Directional Pad
*0 - no movement
*1 - Right
*2 - Left
*3 - Left + Right
*4 - Down
*5 - Down + Right
*6 - Down + Left
*7 - Down + Left + Right
*8 - Up
*9 - Up + Right
*A - Up + Left
*B - Up + Left + Right
*C - Up + Down
*D - Up + Down + Right
*E - Up + Down + Left
*F - Up + Down + Left + Right

Buttons
0* - not pressed
1* - Start
2* - Select
3* - Start + Select
4* - B
5* - Start + B
6* - Select + B
7* - Start + Select + B
8* - A
9* - Start + A
A* - Select + A
B* - Start + Select + A
C* - A + B
D* - Start + A + B
E* - Select + A + B
F* - Start + Select + A + B

Sprite Flags

• $04B4 - Something to do with the Hawkmouth opening and closing

• $04AD - Current number of enemies defeated to grab a heart.

• $04B0 - Has Key been used on lock?

00 - no
01 - yes - If yes, then it won't reappear.

• $04B4 - How wide Hawkmouth is open
• $04B5 - Has the Crystal been obtained? If yes, effect will last while in area.

00 - no
01 - yes

• $04B6 - look into

• $04BE - Time counts up for how long the door takes to open

• $04C4 - Amount of time left for the screen to shake after POW
• $04C5 - Height to raise and lower the "level" for shake
• $04C6 - Amount of time left for bomb flash in background

• $04CA - Amount of time to build up to charged jump

• $04E0 - Current Starman time length left

Regeneration properties

• $04E7 - Area
• $04E8 - Sub-area
• $04E9 - Page

Mushroom Flags

• $04FB - Has First Mushroom been pulled? If yes, then it won't reappear.

00 - no
01 - yes

• $04FC - Has Second Mushroom been pulled? If yes, then it won't reappear.

00 - no
01 - yes

• $0620 - Has 1-up been pulled?

00 - no
01 - yes - If yes, then it won't reappear.

Subspace Related Properites

• $0621 - Number of times leaving Subspace aftering grabbing a coin

00 - 1st chance to grab coins
01 - 2nd chance to grab coins
02 - No more chances, get vegetables.

• $0628 - In subspace?

00 - no
02 - yes (doesn't work for vertical areas)

• $0629 - look into

Level in Memory

$0531 - Current level loaded

00 - 1-1
01 - 1-2
02 - 1-3
03 - 2-1
04 - 2-2
05 - 2-3
06 - 3-1
07 - 3-2
08 - 3-3
09 - 4-1
0A - 4-2
0B - 4-3
0C - 5-1
0D - 5-2
0E - 5-3
0F - 6-1
10 - 6-2
11 - 6-3
12 - 7-1
13 - 7-2

Character Properties

• $0546 - Pickup Speed Animation 1
• $0547 - Pickup Speed Animation 2
• $0548 - Pickup Speed Animation 3
• $0549 - Pickup Speed Animation 4
• $054A - Pickup Speed Animation 5
• $054B - Pickup Speed Animation 6

• $054D - Standing Jump Height
• $054E - Crouching Power Jump Height

• $0550 - Running Jump Height
• $0551 - Running Jump Height while carrying object

• $0553 - Float Timer (set to 0 for everyone but Princess)

• $0555 - Character's Jumping physics?

Music and Sound Properties

• $05EE - Current music track?
• $05EF - Current music track?

• $0600 - Loads the current song track
• $0601 - Plays a sound effect
• $0602 - Plays a sound effect
• $0603 - Plays a small clip of music (and also for ending sequence)
• $0604 - Character's sound effects
• $0605 - POW sound effects
• $0606 - Stores sound effect from $0603 played
• $0607 - Stores sound effect from $0602 played
• $0608 - Stores sound effect from $0601 played
• $0609 - Stores music track from $0600 played

• $0612 - Current music tempo

World Properites

• $0635 - Current World number (loads characteristics of world such as Ice)

Graphics Tileset

• $06F7 - Current Level Tileset (1st half of the right Table)
• $06F8 - Current Cycling Sprite Tileset (2nd half of the right Table)
• $06F9 - Current Character (Appearance,not stats) (1st quarter of left Table)

00 - Large Mario
01 - Large Luigi
02 - Large Princess
03 - Large Toad
04 - Small Mario
05 - Small Luigi
06 - Small Princess
07 - Small Toad

• $06FA - Current standard sprites (Snifits, Hawkmouth, etc.) (2nd quarter of left Table)
• $06FB - Current standard sprites (1-Up, Birdo, etc.) (3rd quarter of left Table)
• $06FC - Current changable sprites (Ostro, Pidget, Pokey, etc.) (4th quarter of left Table)
• $06FD - Current animation of $06F8 (Cycling sprites)

Level Layout

• $0700 ~ $07FF - Subspace and jars
• $6000 - $695F - Currently loaded level (Almost half the SRAM)

References

http://www.tekhacks.net/forum - lost when forum was removed (recovered by internet archieve) http://board.acmlm.org - lost when board was remade (recovered by internet archive) http://bmf.rustedmagick.com/